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Isuzu 4ZD1 specs: 2.3L (140 ci) 4-cylinder, 89.3 x 90 mm (3.5157 x 3.5433 in) bore and stroke, 8.3:1 compression. Rated 96-110 hp, 1986–1995.
The Isuzu 4ZD1 is close to square: 3.5157" bore against 3.5433" stroke, within 0.8%, which splits the difference between a high-revving layout and a torque layout. The 3.5433" stroke puts mean piston speed at 4,000 ft/min around 6,750 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 35.0 ci (574 cc).
8.3:1 is low by modern standards and generally happy on regular pump fuel.
12 factory variants share these dimensions, rated from 96 to 110 hp across 1986–1995.
| Displacement | 140 ci / 2.3 L |
|---|---|
| Bore | 3.5157" * |
| Stroke | 3.5433" * |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 8.3:1 |
| Bore/stroke ratio | 0.992 |
* Bore and stroke from a single source; not yet cross-verified.
| Fuel type | gas |
|---|---|
| Advertised HP | 96–110 hp |
| Years | 1986–1995 |
| Bore/stroke character | 0.992 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,543 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 35.0 ci |
| Static compression | 8.3:1 — low by modern standards, generally happy on regular pump fuel |
Each link opens the calculator with this engine's specs already filled in.
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| 1986 | 96 hp | 4ZD1 |
| 1987 | — | 4ZD1 |
| 1988 | — | 4ZD1 |
| 1988 | 110 hp | 4ZD1 |
| 1989 | — | 4ZD1 |
| 1989 | 110 hp | 4ZD1 |
| 1990 | — | 4ZD1 |
| 1991 | — | 4ZD1 |
| 1992 | — | 4ZD1 |
| 1993 | — | 4ZD1 |
| 1994 | 96 hp | 4ZD1 |
| 1995 | — | 4ZD1 |
4 factory vehicles, 1986–1995. Each year opens that model's engine table.